CVSROOT=:pserver:cvs@foo.bar.com:/home/cvsroot

Here's an example of a CVSROOT for a remote repository that exists on the foo.bar.com host and lives in the /home/cvsroot directory on that machine. The leading ":pserver:" part tells our client to connect to this remote machine using the CVS password server protocol, a protocol that's built-in to CVS. Typically, public CVS repositories use the password server protocol to allow access to anonymous users.